Pipe or nut wrench



(No Model.)

G. B. SCI-IAEFFER.

' PIPE 0R NUT WRENCH.

No. 464,899. Patented Dec. 8, 1891.

UNITED STATES PATENT OFFICE.

GEORGE B. SCHAEFFER, OF CHICAGO, ILLINOIS.

PIPE OR NUT WRENCH.

4 SPECIFICATION forming part of Letters Patent No. 464,899, dated December 8, 1891.

I l I I Application filed April 1, 1891- fierial No. 387,306. No model.)

. T aZZ whom, it may concern:

Be it known that I, GEORGE SCHAEFFER, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, haveinvented certain Improvements in Pipe and Nut Wrenches, of which the following is a specification.

My invention relates to that class of wrenches capable of being used either as a pipe or nut wrench. As a nut or monkey v wrench it relates to that particular class in spring-dog from the upper to the under side of the movable jaw, as will be hereinafter more fully described.

Figure 1 is a perspective view of my invention used as a nut or monkey wrench. Fig. 2 is a sectional view in the line a; 00, and Fig. 3 is a sectional view when my invention is used as a pipe-wrench.

In the drawings, A is the fixed or rigid jaw, formed integral with or attached to the shank B, provided with the handle E.

C is the movable jaw, carrying the springdog F, and s s are steel pins on which said dog works.

Upon the upper and lower surfaces of the shank 13, near the handle E, I provide grooves or recesses a a and form fine sawshaped teeth I) Z) across the upper and under side, and to such a distance on said shank B as will correspond with the travel of the movable jaw. The teeth I) I) point toward the movable jaw and hold it from sliding backward when in use. I

The movable jaw C is made with a suitable opening to allow a free sliding motion on the shank B and only a downward motion to the heel of said jaw, as clearly shown in Fig. 3. Thus I secure the diversilole angle necessary to the engaging faces of the jaws A and C to properly grip a pipe or other round surface. To the upper and under end of the ears formed by the sides of the shell extending beyond the body of the movable jawI secure two steel pins 5 and 5' about on a line with the upper and under face or shell of the movable jaw-gleaving sufficient room between said pins and the body of the movable jaw to receive the spring-dog F. 1

The spring-dog F, I make nearly L shape, filling the space between the ears, and it is provided with a socket on its V-shape-d end to fit the pins 8 and s. The spring t is riveted to the under side and at the end of the arm of said dog, thus locking the movable jaw to the shank atany desired point. I make the solid V- shaped end of the dog F of such a length that when in working position on either pin its outer face will stand nearly at right angles to the shank. I have a twofold object in doing so: First, it allows me to use the finest of teeth or serrations on the shank, and as a result when my movable jaw is run up to a nut or pipe there is little or no giveback to said movable jaw, consequently I need no device for a take-up, second, when the strain is on the nose of the movable jaw there is an immediate grip, and the sharp edge of the dog F presses nearly square down on the bottom of the serration, and the tendency is to deepen the tooth, thus compensating the wear on the points of the serrations as the dog F passes over them when the movable jaw is run. up to a nut or pipe.

Any overstrain such as would leave the shank bent does not interfere with the working of my movable jaw. All I require is to allow sufficient space between the body of the movable jaw and the arm of the spring-dog so that when the arm is pressed down against the movable jaw the sharp edge of the dog will be raised sufficiently high above the serrations to allow a slight bending of the shank should it by accident occur. The movable jaw is then released, and it has a free backward motion to be reset to another nut.

To transfer the spring-dog F from the position shown in Figs. 1 and 2 to that shown in Fig. 3, the movable jaw C is run back until the lower end of the spring-dog projects into adapt it .to the use of my invent-ion would bev the serrations and slight shoulders or notches across the upper and underside of said shank B therefore any mechanic could easily fit one of my movable jaws to an old shank, and thus at slight expense obtain a new nut-wrench with the addition of apipe-wrenoh. The ears of the movable jaw are sufficiently rounded to hold the body of the movable jaw awayfrom the handle when required to transfer the spring-dog from the pins to change the wrench from a nut to a pipe wrench, or vice versa. The upper face of the dog F is serrated, as shown in Fig. 1, to keep the thumb from slipping in removing the dog.-

gaging face of the movable jaw is provided with a toothed face-plate.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is a 1. In a wrench, the toothed shank B, provided with the grooves or recesses a a, fixed jaw A, and handle E, in combination with the movable jaw 0, provided with the dog F, spring 25, and pins 8 s, as herein described, and for the purpose set forth.

2. In a wrench, the movable jaw 0, having pins 8 s and provided with the detachable spring-dog F, in combination with the shank B, provided with serrations b b, notches a a, fixed jaw A, and handle E, substantially as specified.

In testimony whereof I have hereto set my hand and seal this 21st day of March, A. D.

GEORGE E. SCHAEFFER. [L.S.] \Vitnesses:

OTTO L. JOHNSON, II. L. PETERSON. 

